The surface segregation in a quenched low-alloy steel tempered in high vacuum in the embrittlement temperature range (350–600°C) has been investigated by XPS and evaluated by electrochemical polarisation techniques in relation to its effects on hydrogen overvoltage. Surfaces vacuum heat-treated show Mn, Si, Cr, S, Sn enrichment. Cathodic hydrogen overvoltage appears to be well related to such enrichment. The maximum overvoltage effect occurs at 550°C corresponding to the maximum intergranular fracture appearance. This suggests a synergistic interaction between hydrogen and segregated impurities.
Effects of surface segregation in a temper-embrittled steel on the overvoltage of cathodic hydrogen evolution / U., Bernabai; B., Brevaglieri; Cavallini, Mauro. - In: MATERIALS CHEMISTRY. - ISSN 0390-6035. - STAMPA. - 6:(1981), pp. 467-478.
Effects of surface segregation in a temper-embrittled steel on the overvoltage of cathodic hydrogen evolution
CAVALLINI, Mauro
1981
Abstract
The surface segregation in a quenched low-alloy steel tempered in high vacuum in the embrittlement temperature range (350–600°C) has been investigated by XPS and evaluated by electrochemical polarisation techniques in relation to its effects on hydrogen overvoltage. Surfaces vacuum heat-treated show Mn, Si, Cr, S, Sn enrichment. Cathodic hydrogen overvoltage appears to be well related to such enrichment. The maximum overvoltage effect occurs at 550°C corresponding to the maximum intergranular fracture appearance. This suggests a synergistic interaction between hydrogen and segregated impurities.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
